package Collection.Map;

import java.util.HashMap;
import java.util.Map;

/**
 * @description:
 * @author: cyy
 **/
public class remove {
    public static void main(String[] args) {
        //remove  key键不存在返回null
        Map<String, Object> params = new HashMap();
        params.put("cyy","123");
        params.put("leilei","456");
        params.remove("aj");
        System.out.println("shitutuya:"+params.size());

        Map<String, Object> a = new HashMap<>();

        String  ab = "{\"产地\":\"其他\",\"报废日期\":\"其他\"}";
        String abc = "{\"cyy\":\"0\",\"cyy1\":\"1\",\"cyy2\":\"2\"}";
        String ABCD = "{\"cyy\":\"1\"}";

    }
}
